Micro differential pressure transmitterThe measurement process pipeline is not easily affected by parasitic thermocouples, voltage drop along the wire, and temperature drift, and can use very cheap and thinner twisted pair wires; The capacitive interference of micro differential pressure transmitters can cause errors related to receiver resistance. The receiver resistance is usually 250 Ω, which is small enough to produce significant errors. Therefore, the allowable wire length is longer and farther than that of voltage telemetry systems. The functional specifications of the micro differential pressure transmitter are digital and intelligent: it can be adjusted using the local range and zero buttons, or remotely adjusted with a HART controller for analog and linear: the range and zero can be continuously adjusted.
Micro differential pressure transmitterIt measures the pressure difference of the medium in the process pipeline or tank. The micro pressure and micro differential pressure transmitter detects micro pressure and micro differential pressure. Generally, pressures and differential pressures below a few kPa are considered micro pressure and micro differential pressure, and the measured differential pressure value is converted into an electrical signal output through data conversion and square root transformation. Choosing a differential pressure transmitter requires knowledge of the differential pressure value, medium, working pressure of the medium, working temperature of the medium, and whether it is intelligent or analog.
Micro differential pressure transmitterPrinciple: The measured differential pressure enters the high and low pressure chambers of the transmitter through a reverse pressure tube. When the high and low pressure chambers on both sides of the detection component are filled with fluid, there is a pressure difference between the high and low pressure sides that acts on the measuring diaphragm and floating diaphragm through the isolation diaphragm and filling liquid. As the external differential pressure changes, the measuring diaphragm produces a small displacement proportional to the differential pressure. The function of the measuring membrane is equivalent to the active electrode in a differential capacitor, its position is fixed by the symmetrical capacitors on both sides, and the capacitance between the electrodes is detected.
due toMicro differential pressure transmitterJust to ensure its accuracy within a certain range of range, for medium pressure, high pressure, medium differential pressure, and high differential pressure ranges, the range of range to ensure accuracy is relatively large, while for micro pressure and micro differential pressure ranges, the range of range to ensure accuracy is usually smaller. The actual accuracy of micro pressure and differential pressure transmitters is often not as high as we imagine, and the indicators of different products also vary greatly. Many users have personally experienced that the stability and accuracy of micro pressure and differential pressure transmitters are relatively poor in actual use. Based on the above reasons, the selection of micro pressure and micro differential pressure transmitters should be a special issue in transmitter selection.
Micro differential pressure transmitterUsed to measure small differential pressures such as furnace pressure, and then convert them into 4-20mA DC signal output. The HQ1151/3351DR intelligent micro differential pressure transmitter can also communicate with the HART controller for setting, monitoring, or forming an on-site monitoring system with the upper computer.